/*
 * Copyright (C) 2012 Rothens
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package rpg.util;

import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import rpg.gfx.Bitmap;

/**
 * rothens.tarhely.biz
 *
 * @author Rothens
 */
public class ImageUtil {

    /**
     * Creates a BufferedImage from the given resource path.
     *
     * @param path
     * @return a BufferedImage, or null if not found
     */
    public static BufferedImage createImageIcon(String path) {
        try {
            return ImageIO.read(ImageUtil.class.getResource(path));
        } catch (IOException ex) {
            System.err.println("Couldn't read image from " + path);

        }
        return null;
    }

    public static Bitmap getSubTile(BufferedImage img, int row, int col) {
        Bitmap ret = new Bitmap(64, 64);

        img.getSubimage(col * 64, row * 64, 64, 64).getRGB(0, 0, ret.width, ret.height, ret.pixels, 0, ret.width);

        return ret;
    }

    public static Bitmap getSubTile(BufferedImage img, int row, int col, int w, int h) {
        Bitmap ret = new Bitmap(w, h);

        img.getSubimage(col * w, row * h, w, h).getRGB(0, 0, ret.width, ret.height, ret.pixels, 0, ret.width);

        return ret;
    }

    public static Bitmap getSub(BufferedImage img, int x, int y, int w, int h) {
        Bitmap ret = new Bitmap(w, h);
        img.getSubimage(x, y, w, h).getRGB(0, 0, ret.width, ret.height, ret.pixels, 0, ret.width);
        return ret;
    }

    public static Bitmap loadBitmap(String path) {
        BufferedImage src = null;

        try {
            src = ImageIO.read(ImageUtil.class.getResource(path));
        } catch (IOException ex) {
            System.err.println("Couldn't read image from " + path);
            return null;
        }
        Bitmap b = new Bitmap(src.getWidth(), src.getHeight());
        src.getRGB(0, 0, b.width, b.height, b.pixels, 0, b.width);
        return b;
    }

    public static Bitmap loadBitmapScaled(String path, double scale) {
        BufferedImage src = null;

        try {
            src = ImageIO.read(ImageUtil.class.getResource(path));
        } catch (IOException ex) {
            System.err.println("Couldn't read image from " + path);
            return null;
        }
        BufferedImage sc = toBufferedImage(src.getScaledInstance((int) (src.getWidth() * scale), (int) (src.getHeight() * scale), Image.SCALE_DEFAULT));
        Bitmap b = new Bitmap(sc.getWidth(), sc.getHeight());
        sc.getRGB(0, 0, b.width, b.height, b.pixels, 0, b.width);
        return b;
    }

    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels; for this method's
        // implementation, see Determining If an Image Has Transparent Pixels
        boolean hasAlpha = false;

        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(
                    image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }
}
